Project description:Epidemiological evidence has reported an associative link between sepsis survivorship and increased risk of dementia, particularly Alzheimer's disease (AD). Paradoxically, population studies show females are less susceptible to sepsis but more vulnerable to post-sepsis dementia, including Alzheimer's disease (AD). Here, we examined the temporal impacts of sepsis on AD pathology using an AD-model (TgCRND8) and wild-type mice, assessing outcomes at 7 days and 3 months post-sepsis. Following 7-days recovery, all male and female post-septic mice showed robust systemic immune activation. At this time, the female AD-model mice accumulated higher hippocampal amyloid-beta (Aβ) and upregulated AD-type transcriptomic signature. On the other hand, male AD-model mice showed no Aβ changes. Notably, wild-type post-septic males, but not females, displayed robust astrocytosis, with little change in microglial proliferation. By 3 months post-sepsis, microgliosis was specifically elevated in wild-type females, indicating a prolonged central immune response. At this time, both male and female AD-model mice showed exacerbated Aβ and anxiety. Gene network analysis revealed a stronger female immune response, while the male response was linked to estrogen receptor (ESR) signaling, with increased ERα protein observed in the brains of post-septic AD males. Together, our data highlights a sex-dimorphic temporal response in post-sepsis neuroinflammation, with ESR signaling playing a key role in males, while Aβ burden is affected similarly in both males and females.
Project description:Ion channel splice array data from temporal cortex brain tissue samples collected from Alzheimer's disease patients. Temporal cortex (Alzheimer's disease affected brain tissue structure) and cerebellum (Alzheimer's disease unaffected brain tissue structure) samples from control subjects were compared to temporal cortex and cerebellum of patients with Alzheimer's disease.
Project description:Ion channel splice array data from temporal cortex brain tissue samples collected from control subjects (no Alzheimer's disease). Temporal cortex (Alzheimer's disease affected brain tissue structure) and cerebellum (Alzheimer's disease unaffected brain tissue structure) samples from control subjects were compared to temporal cortex and cerebellum of patients with Alzheimer's disease.
Project description:In this study, we coupled microarray-based transcriptomics and MS-based phosphoproteomics assay to determine mRNA, protein, and phosphopeptide expression levels from 71 autopsied temporal cortical samples, with varying degree of Alzheimer's Disease (AD)-related neurofibrillary pathology. With computational analysis, we identified disease-related transcript, protein and phosphopeptide expression patterns, associated with distinct biological processes and cell types.
Project description:Ion channel splice array data from temporal cortex brain tissue samples collected from control subjects (no Alzheimer's disease). Keywords: disease associated splicing changes
Project description:Sterile neuroinflammation initiated by damage-associated molecular patterns (DAMPs) has been regarded as an important driver in Alzheimer's disease (AD) and can occur prior or independently of the deposition of extracellular amyloid-β (Aβ) plaques and intracellular tau neurofibrillary tangles (NFTs). Genetic ablation or pharmacological inhibition of GPR34 reduced microglia activation, Aβ deposition and cognition impairment. Moreover, GPR34 inhibition prevented aging associated neuroinflammation and cognition impairment without the presence of Aβ plaques.
Project description:Ion channel splice array data from cerebellum brain tissue samples collected from Alzheimer's disease patients. Temporal cortex (Alzheimer's disease affected brain tissue structure) and cerebellum (Alzheimer's disease unaffected brain tissue structure) samples from control subjects were compared to temporal cortex and cerebellum of patients with Alzheimer's disease.
Project description:Microbial infection, the strong trigger to directly induce inflammation in brain, is long considered a risk factor of Alzheimer's disease (AD), but how these infections contribute to neurodegeneration remains underexplored. To examine the effect of herpes simplex virus type 1 (HSV-1) infection on tauopathy in local hippocampus of P301S mice, we utilized a modified HSV-1 strain (mHSV-1) potentially relevant to AD, we found that its infection promotes tau-related pathology in part via activating neuroimmune cGAS-STING pathway in the tau mouse model. Specifically, Sting ablation causes the detectable improvement of neuronal dysfunction and loss in P301S mice, which is causally linked to lowered proinflammatory status in the brain. Administration of STING inhibitor H-151 alleviates neuroinflammation and tau-related pathology in P301S mice. These results jointly suggest that herpesviral infection, as the vital environmental risk factor, could induce tau-related pathology in AD pathogenesis partially via neuroinflammatory cGAS-STING pathway.